Method of and apparatus for making paper bags



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0. .B. STILWELL. METHOD 0? AND APPARATUS FOR MAKING PAPER BAGS.

Nq. 508,059. Patented Nov. 7, 1 93.

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(No Model.) 4 Sheets-Shet 2. G. B. STILWELL.

METHOD OF AND APPARATUS FOR MAKING PAPER BAGS.

No. 508,059. Patented Nov. '7, 1893.

(No Model.) 4 Sheets-Sheet a.

O. B. STILWELL. A

METHOD 0]? AND APPARATUS FOR MAKING PAPER BAGS.

No.- 508,059. Patented Nov. 7, 1893.

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.0. B. STILWELL. METHOD OF AND'APPARATUS FOR MAKING PAPER BAGS.

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UNI-TED STAT-ES PATE T. OFFICE.

CHARLES B. STILWELL, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE UNION PAPER BAG MACHINE COMPANY, OF SAME PLACE.

METHOD OF AND APPARATUS FOR MAKING PAPER BAGS.

SPECIFICATION forming part of Letters Patent No. 508,059, dated November 7, 1893.

7 Application filed April 17, 1893. Serial No. 470,622. (No model.)

form a part hereof.

My invention relates to that stage of the manufacture of paper bags in which what is technically known as a diamond folded blank is formed into a bag by the folding of the two flaps of the diamond toward each other.

My present invent-ion is applicable to all bags having diamond folds, but'is particularly adapted for the completion'of what are known as bellows-folded satchel-bottom bags.

The nature of myimproved process and apparatus will be best understood as described in connection with the drawings in which they are illustrated and in which Figure 1 is an elevation partly in section of my improved apparatus; Fig. 2 an elevation showing the shafts and train of gear forming part of the apparatus; Fig. 3 a plan view of the mechanism shown in Fig. l omitting the two feed wheels indicated at Q and C. Fig. 4 is an elevation of a cam forming part of my apparatus; Fig. 5 a perspective view showing the detail of another part of the, apparatus; Figs. 6, 7 and Sdiagrams illustrating the operation of the machine uponra paper blank; Figs. 9, 10, lland 12 illustrating the blank in various stages of the operation of completing the=bag; and'Fig. 13 is a perspective view of a completed bag.

To explain first the method of operating upon the blank, Fig. 9 is'a perspective View mechanism and is the thing upon which my.

showing a bellows-folded blank with the dia mond fold formed upon one end of it. This, blank is madeby any convenient process or new operations are performed. 7

A indicatesthe body of the diamond-folded I blank; A' the diamond fold as a whole.-

shown as partly folded upward and backward on the line a a. In Figs. 11 and 12 this backward foldingof the front flap is illustrated as still further progressed, and in Fig. 13 it-is shown as completelyfolded backward and downward upon the center of the center of the diamond and arounda line approximately coinciding with the line apa; the. rear flap A is pushed upward and forward with U-fold and finally pressed down upon the center of the diamond as indicated in Fig. 12-Fig. 11 illustrating the operation as about one-half completed. Preferably the rear flap A is pressed down upon the center of the diamond in advance of the front flap A which is then pressed over it as indicated in Figs. 12 and 13. It will be seen that no permanent crease is formed in the body of the blank by forming the U-like fold therein as described, and after the bottom of the bag is closed the U -f0ld can be straightened out leaving no permanent mark upon the blank.

Referring next tothe mechanism which I have devised andwhich I prefer to use in carrying out the above described process or method, B indicates the frame of the machine.

C and (1' are feed rolls supported on shafts c and o the function of which is to engage the blanks delivered to them by mechanism (not shown) for forming the diamond folds.

.D indicates a guide preferably made adj uststandard projecting from the frame; the function of this guide being to carry the blank from the bite of the rolls 0 O to the bite of G', which in turn is secured to a lever G piv- IOO oted at G and having a cam roller G which rests against a double cam H, (see'Figs. 3 and- 4,) said cam being secured on the shaft 0. The action of this cam is to alternately raise and lower the finger G, which, in its lower position, extends through an opening F in the table F and lies directly in the path of an advancing blank. The action of the finger in this position is illustrated in Fig. 6,the front flap A of the diamond being pushed upward by said finger as the blank advances from the rolls C and D. As the blank continues to advance the finger G is raised by the action of the cam as is shown in Fig. 7; in this position it permits the blank to move under it on the table, but still keeps contact with the flap A which, as the blank moves forward, is pushed backward over the line a by the end of the finger G which prevents the flap from springing forward until itis nearly in the bite of the feed rolls N N.

I I are fingers acting intermittently to clasp the blank to the table, hold it there for a defined length of time and then release it. The rear edge of the fingers I should engage the blank at or slightly in advance of the line a 0. upon which the rear flap is folded forward. The fingersI and the mechanism for operating them are shown in Figs. 1, 3 and 5. They are fastened to a bar I, the lower end of which, 1, projects below the fingers, and the upper end of which, 1 is journaled upon a shaft or bolt 1 but is clamped upon the said bolt in such a way as not to turn freely thereon, the turning of the hub being resisted by a certain amount of friction. The bolt 1 is secured on the end of a pivoted lever 1 said lever being pivoted at l, and being provided at- I with a pin which extends down into the groove of a cam J, said cam being secured upon the shaft e. There are, as appears in the drawings, two of such cams and two similar devices connected with each finger I. On the frame of the machine I secure upwardly-projecting fingers 1 1 between which the depending end I of the rod 1' lies. As the end of the lever I is thrown out, the part I comes in contact with the outward finger I and pushes the rod 1' and the attached finger I upward. By reason of the frictional resistance by the turning of the hub it retains this position while moving inward and until the end 1 comes in contact with the inside finger I which moves the bar I downward and with it the finger I until said finger presses against the table F and clamps the blank between it and the table. This mechanism is arranged as I have already stated so as to engage the blank justin front of the line a a, and the fingers remain in this position clamping and holding the paper motionless upon the table while the finger J is performing its function of throwing forward the rear flap of the diamond, after which the fingers I release the paper and are thrown backward to permit the advance of the blank preferably accomplished by a continued forward motion of the finger J. The finger J attached to a shaft is driven from the shaft 0' as 7 shown in Fig. 2. From the upper end of the rod J extends an arm J having at its end a cam rollerJ" which moves in astationary cam groove M. By this arrangement it will be seen that the longitudinal motion of the fingerJ is governed by the cam K and its vertical motion by the stationary cam groove M. The action of the two cams upon the fingerJ and the action of said finger upon the blank is best followed in Figs. 6, 7 and 8. As the blank is fed over the table F the rod J rests beneath it and does not operate upon the blank until it is seized by the fingers I. As soon as it is so seized and its front end held stationary upon the table, the finger J moves upward and forward engaging the blank beneath the rear flap of the diamond fold, and as the blank is fed from between the rollers (J and E the rod J takes up the slack and forms the U-shaped fold A in the body of the blank, carrying this fold upward and forward as shown in Fig. 7 and pushing in front of this fold the rear flap A of the diamond fold, this action going on until said rear flap is pushed down upon the central body of the diamond. The fingers I then release their hold upon the blank which is carried forward, preferably by a forward motion of the finger J, until it is engaged by the feed and presser rolls N N at which time the finger J is rapidly retracted. It will be noticed by reference to the diagram Fig. 2 that the rollsNN' are driven with much greater speed than the rolls 0 E, consequently they act to roll out and straighten the U-shaped fold A and the bag is delivered from said rollers N N to an y convenient carrying device as, for instance, a belt running on'the roller P.

It will of coursebe obvious to one skilled in the art that to operate my method and apparatus to the best advantage the diamondfolded blank should be subjected to a preliminary creasing operation on the lines a a and a a.

Having now described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. The method of making the final folds in a diamond-folded bag blank which consists in folding the front flap of the diamond back, forming a U-shaped fold as A in the body of the blank beneath the rear flap of the diamond, and pushing said fold together with said rear flap forward as described and so as to cause the two fiaps of the diamond to overlap and complete the bag bottom.

2. The combination with mechanism for with constant speed in the rear of said hold-' holding a diamond-folded bag blank, of con= stantly acting feeding mechanism moving gage the body of the blank beneath the rear flap of the diamond and thrust it upward and forward in a U shaped fold, all substantially as described and so as to fold the rear flapof the diamond forward on the bag bottom.

7 3. The combination with mechanism for holding a diamond folded bag blank, of constantly acting feeding mechanism moving ing mechanism, a folder J arranged to en'- gage the body of the blank beneath the rear flap of the diamond and thrust it upward and forward in a U shaped fold so as to fold the rear flap of the diamondforward on the bag ing said finger above the table and lowering bottom andfeeding mechanism situated in front of the holding mechanism an'dmoving at -a greaterspeed' than the rear feeding mechanism. I

4. The combination withfeed mechanism of a'table F over which the bag blank is fed and-in which is formed an opening F, a fin ger-Gr arranged-above said opening with a backward inclination, and mechanism for raisit as described, i-nto' opening F so that said finger will engage with and bend up the front flap of the diamond as the blank advances over the table andthen-raise, permitting the blank to move between it and thetable and at the same time push the flap back over the advancing blank; a

5. The combination with feed mechanism of a-table F over which the blanki is 1 fed, in-

termittently-acting grippers I I arranged to U -shaped fold described. a r 6. The combination with feed mechanism of atable F over which the blank is fed, intermittently-acting grippers I I arranged to grip the diamond folded end of the blank to the table in front of the rear flap of said diamond, an intermittently-acting rod J arranged to engagethe'blank below the rear flap and push it upward and forward in a U-shaped fold to press the flap forward as described, a finger G and'mechanism for actuating said finger as described and so that it will engage and push up the front flap of the diamond as the blank is fed to the table and then raise permitting the blank to'move under it and pushing back'said flap as the blank so moves. 7. The combination of the feed roll 0 with the co-acting rolls 0' and E, guides as D whereby the blank is directed from the bite of the rolls 0 O to that of rolls OE, the table F set in front of rolls 0 E to receive the blank, the fingers I I arranged to grip and release the blank at determined intervals,and the intermittently acting rod J arranged to engage the body of the blank and push it and the rear flap of the diamond over fingers I I.' 8. The combination of the feed roll 0 with the co-acting rolls Cf and E, guides as D whereby the blank is directed from the bite of -rolls 0 O to that of rolls 0 E, the table-F set infront of rolls 0 E to receive the blank, the finger'sI I arranged to grip and release: the blank at'determined intervals; the intermittently-acting rod J arranged to engage the body of the blank and push it and the-rear flap of the diamond over fingers I I and the finger G arranged to engage the front flap of the diamond and to push it back as described." 1 CHAS. B. STILVVELL."

to press the flap forward as Witnesses:

ALF. H. FABER, V -EDW. F. AYRES. 

